Very common. Appears
to breed early in March, as full fledged young were about in the
middle of April.

All the specimens
show a narrow circle of white feathers round the eye; and many of
them have pale greyish white margins to the secondaries and wing-coverts,
and the under tail-coverts tipped with white. The pale margins are
probably remains of the immature plumage (which is blackish grey,
each feather more or less margined with white); but the white circle
round the eye appears to be a permanent feature.